diff --git a/src/playsim/actor.h b/src/playsim/actor.h
index 37c27a820..c2e06cc8c 100644
--- a/src/playsim/actor.h
+++ b/src/playsim/actor.h
@@ -1313,7 +1313,7 @@ public:
 	int				DesignatedTeam;	// Allow for friendly fire cacluations to be done on non-players.
 	int				friendlyseeblocks;	// allow to override friendly search distance calculation
 
-	AActor			*BlockingMobj;	// Actor that blocked the last move
+	TObjPtr<AActor*> BlockingMobj;	// Actor that blocked the last move
 	line_t			*BlockingLine;	// Line that blocked the last move
 	line_t			*MovementBlockingLine; // Line that stopped the Actor's movement in P_XYMovement
 	sector_t		*Blocking3DFloor;	// 3D floor that blocked the last move (if any)
diff --git a/src/playsim/p_mobj.cpp b/src/playsim/p_mobj.cpp
index 105eb8908..33c44facc 100644
--- a/src/playsim/p_mobj.cpp
+++ b/src/playsim/p_mobj.cpp
@@ -178,6 +178,7 @@ IMPLEMENT_POINTERS_START(AActor)
 	IMPLEMENT_POINTER(goal)
 	IMPLEMENT_POINTER(LastLookActor)
 	IMPLEMENT_POINTER(Inventory)
+	IMPLEMENT_POINTER(BlockingMobj)
 	IMPLEMENT_POINTER(LastHeard)
 	IMPLEMENT_POINTER(master)
 	IMPLEMENT_POINTER(Poisoner)